D20964: [FileWidget] Replace "Filter:" with "File type:" when saving with a limited list of mimetypes

[Nathaniel Graham]

ngraham added a task: T8552: Polish Open/Save dialogs.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D20964

To: ngraham, #vdg, elvisangelaccio, GB_2
Cc: apol, kde-frameworks-devel, michaelh, ngraham, bruns